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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df282dff80fe53e2eb54be0f5e986d5b2dd0ab53cc4528b2274987ed5e8a24ee' 
  AND token = 'xu67ZPHiMa6Zn3ydeTjfWbUBUC8fTlopjIcJf1WiJA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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