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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bedb170e4b716243be8214f4b959a4c584547bd1db1ed9e6bb6adcbdd5c99bc' 
  AND token = 'CpDg27qByCxVBeW1nx6T8QnlnxULQHsuXMYvDubkUGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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