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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775e7c820b9eb8fb08b9bccbc24c1514a89a5dc82e74fc980428fc8b3617adc2' 
  AND token = '+nhkuHT6ghL76ILqKm2s2XyiRTzxV33pnfsCzuPB2p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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