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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52f4ae6750a1a5181d789d74de4fa1beb00de123c935c418024d8afd6bb0dad' 
  AND token = 'f6A3b+iad8oDEgt8n0yXQ8Bnpc8PrQFjvbzKYu9/YZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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