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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5817e5be541f4ca28b39a64359ae1a146462b8efd4932b9142bef5b2fc01bd5a' 
  AND token = 'SgcxAXHpqH9E4gzcyyA8q/+deb96JWDWlPuGSKzGdJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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