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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7212865ae0a2c530c34d3569d5144dfbee44a681f219fdddc87428ba56e34b9' 
  AND token = '2HgdkDE8lM9Wrp39JE0BG0DFA/+goViekGAgso8r3+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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