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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8608d21d1c4e17bcc4686f93f8bf398b76a1c30b313f86893a3d7b9a545a16' 
  AND token = 'm31MRNGQuPzAeL9hRoVa63844Ue/NI1STQg+dYOeT/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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