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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4764ca111a95ef8823163927691a713f03451467e856f181bee374cc84902fff' 
  AND token = 'Ufos8ZrvnDtnN5BoMpLzOv1wx0XyYjPHi1fQ575ko1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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