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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460f0a5b4fcde33fed2f3765849d04bfe9251d78d74b32d98f55ca3e6773a44b' 
  AND token = 'U4brhVuqyixWAkdeiuvcnJBlQyh/0CCA8tJddKQN78s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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