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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db07960f1b3e8bda977a7aafb81c3cd494299269a06a546d16b6137b8ebc8b27' 
  AND token = 'vayju4j0xP+B893ggPTKDdmsslG2bLgojMBSbnQEwwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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