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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d5be0e69e1829d0822d0977c718b586628f197e1a28d34470803399af51cac' 
  AND token = 'A7ZpUhfCDE/TfDP/Pu6P6k9/2/H7QV9kUPunG6iynGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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