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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5adf4562967cf62019814e5a1462977a170d1505cec2c1b1cfe9d4bd760f66d' 
  AND token = 'eORLhz/zv7TquJxHm98O4puFFEVTLA4R7tSI3r6K/ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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