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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987fc7c7ab98e651ed7cb3fd1b424db4bba694d42afbb649b5390375bb48a3e5' 
  AND token = 'K/G2rgTS5QbBvFCZIabThG1BZz/bMdCKbrUOXSjSfUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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