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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27dc2667890d8d86989436055f7443d87611739f513625c0a329f49da457af60' 
  AND token = 'zL8lZ/fD0rkYBn3JYeDGQ5bCBimHS0s7q1kkumY18wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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