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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab99912c04a2f53e7b7441486a27f4171bf915f4fe89045a4124973908e7fe2b' 
  AND token = '3n5pjxvSFv99JmA3DXZ4rEj+zHmKE77e+ury5UH6vUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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