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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42352c083ff87459c5a6b2ca088878d766f5859c67885766f886b8e2e72eddd' 
  AND token = '9gcvS3s/yv7sAHX7aIOZwY/5HQryOGLb27jK9n7Fl5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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