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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158b01c85592a3105adad3d787feac03dfb460603eea469b0913d7f2057fbafe' 
  AND token = 'UTM2Ab0xfGco7+G6vr9OSZvftiEOneCj58/ae29yQ50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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