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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3d7e48ff2f0fa8d375e04a381e67a5c95e5b420c426a2879eee3d9145ac858' 
  AND token = 'Pp32Ioiqi9Tphzgfru0vKa/I6vx0Cdx/dYnpb/ovlPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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