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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9d697ef1f3dc31d5f8fa8d776f368f87b68b2f99aaff1ea9cc1f85bf1a9a14' 
  AND token = 'n4V9rSRkxVVJUEaqsnL1x+hOjtEiLhUZogaEkdi5I5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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