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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c32e137a247ec8bc26d8d2c2261e4129acbaca0223f6c9e5bd271835eb8e49' 
  AND token = 'S6cyd+enGXmwLGSfB8HNqlTF5QWT6UlKqiQyIt8K+4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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