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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0d08c89f869c21b70193ae19004350994668d72306a865e8ead84a63a137c8' 
  AND token = 'vLxaTviUz5cyiE2oxRRZ5Z1Zm4U8zMoFFB0OUpw6Eb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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