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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36179b6be0feb93d0cf9bb2b845125710171542a46e427a9e2addd3543ce1427' 
  AND token = 'Ck3s54J+4lT/m15EHfevk4u23weHA9DvcCAJ+0spJpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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