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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afcec0fa0e7103931bb7e354746481bcb8ff54fc07ac1d2c43b7f93dcbb7021c' 
  AND token = 'QFxC381SFrSdbqH4+RsAYNMLtM0GqVhphPil8FebCqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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