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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0e57caac5dcf6ca71929ced6a3ce427dba4cb45d08fdd9b5d0f26769a0998f' 
  AND token = '96OcFx2jNO/NoVdC3V/8geZO7estNNlCj80I1+fEgjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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