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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3cd98fa749977a433782497cb49496e71443fb814d0f1a5f14b1e975069ae9' 
  AND token = 'IDd4xeqrltQyAA9E7soj2Ge7lh4bAvGsTkNmGpJVuHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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