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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0107cc8d5a901248593ac18f8eff0061f13e6c85663ea888e329e8cdc7a45e' 
  AND token = 'B7sIObBre9qnCDSoq3x4DChzaSmez+78D94GlOuLoHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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