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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b27b4e84a55ea2e91683da4b979add8e8ec9ec3caeec078ddbf95f85fedbf7' 
  AND token = 'u9DD990NdDvGaFuLZ9Iz/IoZydWChFl5viy1h60r0bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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