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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a8becc289b8620ffd107740297083ef1d903ae6193b5106a19a794a948d642' 
  AND token = 'lEQ8psKJI9wogtna6ay53q/679y3YgYwzsraNURZmIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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