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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc7c97fc594b51db564844117d66e8ced4ed7060841e6abd9b002880b58bc12' 
  AND token = 'H5tw1OBIDeE1telK/cwaCVX++U70ajS8c6V7Ls7Ty0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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