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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879235e1058da3b71df49daba3cc7f09d0035ce65b84493234f3e8309f0265e6' 
  AND token = 'cPxQD0i61irXfi4XDfIEy3NhngLWBZ6q+2pSh8ZufCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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