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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7f31a746288d772e967f5c3a8ea91f7b93d4eaf8cec9ca8c21888b072a02e4' 
  AND token = '9Tt0+TqCQTWuOj+QvkHwacTZqiHuXPLSzIOfvPR6/bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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