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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9568fd9a03b709f96fcf7e9a08f83a097a0933ae26a30fab915115d263809b' 
  AND token = 'pcS+xi7bCjcn/Jj90SUFxDA/296V1WbfHGpzcpWMtLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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