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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6898ab1ab93a62cbc2c94e1d718d681eb87e2bcf59477766be1e75c168881b86' 
  AND token = 'JOjYoWbk97c40nLMxKp+ySXrhMQCU8eFA/mtWe8AFwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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