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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00d827777ace4fd32070af06061b21302524ec86a56d8ce0069abc6f9c9e577' 
  AND token = '46ARjF9EwT7ai3Voilyd9GVLSQZgYfFPVkKDpzTKheo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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