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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c7feaf284a691881f96539145da5fa7e77df57eeef1c88126b83514985510d' 
  AND token = 'u75o32f1uHdHY2r0Ut8K1b3Glj3DR7l4rb4vnFGd2x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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