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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6439b1419b59a5536ce4fd18bc030be5943a871bece49a8f2e206a1546ea3333' 
  AND token = 'BvE4atnCvyJVovVI9vZ1i15EwzrYOCQ6SN8DT1dNcTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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