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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c39e9bd9059b04601d6f8106dc2ded1c54e964dc1cd6142eb4cad9ea9c3ee3' 
  AND token = 'JieIAvQnUQ0zHmicVG3eogVooPNjX/xUuYOFh2hwM0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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