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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae387bac66a579f92aae1c6647401b4551b9d6b6844a09d6d991b95fcc57ffe6' 
  AND token = '+Lyg7SxncoMtci6/regN6uB0iGTf9H/cnX2GORHXMz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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