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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8abeaea2ec8960c580e035b5e390f89442bf277280b58fc80554b28de04a7e30' 
  AND token = 'onSUrgDcHcqFYouwy2v78ui3jPeZiV4Nhd0DQtlR23A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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