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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342232027a07a958d721152e69c771033a4b51916733918de314f3cff6222414' 
  AND token = 'YyFKu678Rgi38ylAxIuDbV3SnyU0Knx2ZXCUm9+3cig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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