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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6518c4c9361db8bc8920e3ef8ba2d8cb56f66716890f8b41b22bb4fe4a5990e' 
  AND token = 'QOHrqXqmxXzeGS3Q2/yUXSk6hcP0LrB6nPjollRNH38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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