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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69469a6abccf5064bd29184e11a6d17fc578c2748aad59ed3909c46b29a8d01' 
  AND token = 'WEmg9z+bSTT5Dx6HNIv/jrqPKyIBhrK2yaV+b9Vpr/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}