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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627cec39b555e8141088ade09e4f8cea9ea701e18d4e7e9129fc57417b2be0f2' 
  AND token = 'QXLxL63pIzEGD91HJu9iPbIevy8UsM2oAnjxU0qe3Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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