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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac9090ff6940ac2cfb61e63fc340bb7ae923e93c9f0e8a94990aca1032830c8' 
  AND token = 'KVYh5PkLVFT+14N0JE9wye3Sph6l0iGy1pjNqXQYkFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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