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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9020d7c82e3bcda8cd5a1ef85c74a5a9b4c530428f5cef4be99f853b5e60c0b' 
  AND token = 'CPS/xUYTjy0WZIAYKDcjYeUfh1+zP6uPuwPLEjcHFaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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