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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d30291bef24b487bf91f11bcfda8a0006f62b428f0e4d03060a20e57d48d8ef' 
  AND token = 'sKa42IRRhxB5b8mhq+EeGC2pfmAgGt9w8ZAvsMwsLiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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