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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a091969c68b01b0265c81ab12a7172a2613d9ead431db159491e05a7fa0221f' 
  AND token = 'lOno0G3/ANhaJFIeY9xVaZXfTaWu+MoReDVa2O7Vd1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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